CVE-2026-56787
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk25th percentile - higher than 25% of all known CVEs
Summary
RTKLIB through version 2.4.3 contains an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function at src/rtcm3.c:1446. Remote attackers can exploit this by sending crafted RTCM3 SSR messages with attacker-controlled signal mode fields, leading to a global buffer overflow.
Risk Assessment
The risk involves remote denial of service or crash of RTKLIB rovers and CORS servers via malicious SSR correction streams over NTRIP or serial connections.
Recommendation
Immediately upgrade RTKLIB to a version newer than 2.4.3 if available, or apply temporary network filtering to block suspicious RTCM3 SSR messages.
Other vulnerabilities in RTKLIB
See all- CVE-2026-56786Critical
RTKLIB through version 2.4.3 contains an out-of-bounds write vulnerability in the decode_type1033 function that fails to clamp length counters to the destination buffer size, allowing up to 191-byte overflow into fixed 64-byte descriptor fields. An attacker controlling an NTRIP or serial RTCM3 correction stream can craft a valid CRC-bearing type-1033 message to corrupt adjacent rtcm_t object members, potentially achieving arbitrary code execution or denial of service.
- CVE-2026-56789Medium
RTKLIB through version 2.4.3 has a heap buffer overflow vulnerability in the readrnxobsb function in src/rinex.c. Attackers can craft malicious RINEX files declaring more than 64 satellites per epoch, causing heap buffer overflow writes and out-of-bounds stack reads, crashing RTKLIB-based applications like rnx2rtkp and RTKPOST.
- CVE-2026-56788Medium
RTKLIB through version 2.4.3 contains an out-of-bounds read vulnerability in the getcodepri function when processing unrecognized RINEX observation codes. Crafted RINEX files with unknown observation types cause negative array indexing into the codepris table, leading to reliable crashes and potential memory disclosure of adjacent global data.
Original NVD description (English source)
RTKLIB through 2.4.3 contains an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function at src/rtcm3.c:1446 that allows remote attackers to trigger a global buffer overflow via crafted RTCM3 SSR messages with attacker-controlled signal mode fields. Remote attackers can exploit this vulnerability by sending malicious SSR correction streams over NTRIP or serial connections to cause denial of service or crash RTKLIB rovers and CORS servers.